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N h0  8
                               0.015
                                                                                        N h0  15
                                                                                        N h0  20

                               0.010





                               0.005




                               0.000

                                        1.0           0.5          0.0          0.5           1.0
                                                                   X


                                                              ()

                                0.008
                                                                                      N h0  8
                                                                                      N h0  15
                                0.006                                                 N h0  20



                                0.004



                                0.002




                                0.000
                                         1.0          0.5         0.0          0.5           1.0
                                                                   X



                                                               ()
                     Fig.(2-6) The variation of || against  for different values of


                                                                               12
                             0 for  =27 0 =5 0 =10  =   =10     =   =1
                                   =100 =02 =0For (a)  = 1000(b)  =5000
                                                                      
                                                                                     
                                                               46
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